diff --git a/mercurial/cext/revlog.c b/mercurial/cext/revlog.c
--- a/mercurial/cext/revlog.c
+++ b/mercurial/cext/revlog.c
@@ -579,7 +579,6 @@
 static int index_fast_rank(indexObject *self, Py_ssize_t pos)
 {
 	Py_ssize_t length = index_length(self);
-	int rank;
 
 	if (self->format_version != format_cl2 || pos >= length) {
 		return rank_unknown;